15:36

Helix construction

17:16

Grade 11 LOCI HELIX Introduction

11:13

Drawing a right hand square thread

29:11

helical spring with square section ( engineering graphics)

3:02

Drawing Gears with a Compass (simplified method)

10:27

Loci Helix (Grade 12) page 9-4

3:24

Left hand helix start at the top

19:02

Loci (Helix) Grade 12 from The Study Pack